can anyone recommend some cheap shmups. I don't want to spend $100 on one game :P

games I own:

R type

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Gradius 3&4

Metal Slug 4&5

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Legendary Wings

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Star Soldier

Zanac

ZanaxXZanac

Lifeforce

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Raiden 3

Deathsmiles

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Soldner X-2

Gekirindan

raystorm